inspection of waterfront facilities using vessel-based
TRANSCRIPT
Inspection of Waterfront Facilities Using Vessel-Based Remote SensingMitchell, Del Bello, Suarez
American Association of Port Authorities Facilities Engineering ConferenceOctober 20-22, 2015
www.fugro.com2
Waterfront Monitoring: remote sensing from the waterside
Waterfront facilities are impacted by erosion, settlement, debris, and wave damage.
But they are difficult to monitor for change.
Remote sensing of the target area from the water using multibeam and mobile laser scanning is often valuable for inspection and assessment
Repeat observations over time provide empirical detection and tracking of change
www.fugro.com3
Bathymetric
(Hydrographic)
Survey
Techniques
www.fugro.com4
Creates swathes of survey data (not just a single beam)
Creates continuous seafloor map
Variable swath width (width vs. detail) and can be rotated
Multibeam bathymetric echosounder (MBES):
Multibeam Sensor in standard orientation
Bathymetric (seafloor) terrain surveys
www.fugro.com5
Creates swathes of survey data (not just a single beam)
Creates continuous seafloor map
Variable swath width (width vs. detail) and can be rotated
Physically or electronically with new sensors!
Multibeam bathymetric echosounder (MBES):
Rotated Multibeam Sensor for surveying laterally to the waterline
Bathymetric (seafloor) terrain surveys
www.fugro.com6
Acoustic Marine Survey (Multibeam)
www.fugro.com7
Primary Use: for Safe Navigation & Charts
www.fugro.com8
Acoustic marine survey sensors play a critical role in producing data for safe
navigation – charts.
Brand Values
Navigation Channel
Wreck
100 m
Key element:
Data is Measurable
in 3 Dimensions
Primary Use: for Safe Navigation & Charts
www.fugro.com9
Dredging Projects
Sand trap
Survey of site before dredging
The data is also essential for volumetric surveys for dredging as well as for marine
construction, maintenance and demolition projects.
www.fugro.com10
Dredging Projects
Sand trap
Survey of site during dredging operations
www.fugro.com11
Dredging Projects
Survey of site after dredging operations
• Feasibility/Ripability
• Template Design
• Volume Estimates
• Slope stability assessment
– Key for dredging in front of berths
• Dredge Monitoring
• Material Disposal & Reuse
www.fugro.com12
Dredging Template
Dredging Volume Calculations
www.fugro.com13
By incorporating mobile laser scanning, a hydrographic survey can be extended
above the waterline.
BOAT-MAP™
www.fugro.com14
Mobile Laser Scanning (MLS)
• Uses a laser for surveying above water to capture additional features
• Often longer ranging laser required, especially in dangerous waters
• Some projects benefit from supplemental capture from land
A valuable supplement to multibeam when surveying at the waterline
Laser
Scanning
www.fugro.com15
Multibeam Bathymetry Echosounder (MBES) Data
• Sonar (sound) based ranging technology
• Wide coverage on both sides of vessel
• Millions of individual point observations
Integrating Bathymetry and Laser Scanning
www.fugro.com16
Integrating Bathymetry and Laser Scanning
Mobile Laser Scanning Data (LiDAR)
• Laser (light) based ranging technology
• Scan land and features beside vessel
• Millions of individual point observations
www.fugro.com17
Integrating Bathymetry and Laser Scanning
www.fugro.com18
National City Marine Terminal
Project Example:
National City Marine
Terminal
Underwater facility inspection performed to provide advice on condition,
suggested maintenance/repairs and estimation by Moffatt & Nichol.
Inspection supplemented by remote sensing, particularly of revetment.
www.fugro.com19
National City Marine Terminal
7 berths + 2,000’ of rubble-mound revetment
2013 dive inspection for 4 berths
7,370 linear feet surveyed – all 7 berths and revetment
2 days (1 day laser; 1 day multibeam)
30 million survey points
151 cross-sections cut
www.fugro.com20
National City Marine Terminal
• Visual inspection is still
critical
• But more difficult to capture
empirical observations
• Difficult to integrate above
and below water
observations together
www.fugro.com21
National City Marine Terminal
• Remote sensing can span the land/water interface
• But lacks the detail and resolution of an underwater inspection
• Cracking/spalling much more difficult to identify
• Occlusions (shadows) hide the back side of piles
www.fugro.com22
Project: National City Marine Terminal
Piles Beneath Wharf
www.fugro.com23
Project: National City Marine Terminal
Port of Los Angeles
Piles Removed from Data
www.fugro.com24
Project: National City Marine Terminal
Port of Los Angeles
Sheet Pile Wall
Bulkhead Wall
www.fugro.com25
Project: National City Marine Terminal
National City Marine Terminal
www.fugro.com26
Project: National City Marine Terminal
National City Marine Terminal
Cross-sections
over top of
revetment slope
Automate at set
intervals
www.fugro.com27
Single Cross-Section
www.fugro.com28
Comparative Analysis: Current Condition vs. Design
PDF Map Book
www.fugro.com29
Additional Examples in San Diego
www.fugro.com30
Additional Examples in San Diego
www.fugro.com31
Additional Examples in San Diego
www.fugro.com32
Additional Examples in San Diego
Piles Removed from Data
Data integrated into Google Earth environment.
www.fugro.com33
Additional Examples in San Diego
www.fugro.com34
Wrap-up
www.fugro.com35
Conclusions
Hydrographic surveys can capture significant detail (but do not
replace hands-on underwater inspection
Laser scanning can be used to extend hydrographic surveys above
the waterline
Data can empirically assess condition changes from design over time
Todd Mitchell Gilbert Suarez Chris Esposito Amanda del BelloFugro Fugro Fugro Moffatt & Nichol
[email protected] [email protected] [email protected] [email protected]
Thank you for your time.
Questions?